On Monday, December 24, 2012 12:35:16 PM UTC-8, Leigh Klotz WA5ZNU wrote: > > I recently built threeneuron's Dekatron spinner and it worked great, but > when I picked it up, the tube (Hivac GC10B) got stuck. > > Remembering some previous work with delivering RF into Neon bulbs to kick > them up to the next energy level, I used my 2-meter ham radio (2 watts) > right near the stuck pin and it started right up. > > I can get it to stick again sometimes by turning the speed down very low, > but it starts up again when I turn the speed back up; perhaps there's a > slight affect on the current from the speed adjustment? > > Anyway, try this trick if yours gets stuck. It will probably work just as > well with an unlicensed 460 MHz FRS (or PMR in England) radio. >
> Leigh/WA5ZNU > Neat, a little RF to energize things. But that means things are a bit marginal, so it may get stuck in the future. I currently attenuate the guide pulse, with R12. At 150K, it limits the pulse to ~130V. But its biased by R16, to about 60V over ground, so the guides idle around +70V, and pulse down to -60V relative to the cathodes. R16 is currently 33K. If you make R16 39K, it should raise the bias ~10V, and see if it still sticks. -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To post to this group, send an email to [email protected]. To unsubscribe from this group, send email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msg/neonixie-l/-/DrDcDOzagokJ. For more options, visit https://groups.google.com/groups/opt_out.
